Hape Quadrilla is a high-quality wooden marble run construction system. It provides QUALITY TIME for the whole family to play together, which is the BEST GIFT for you and your loved ones. It provides endless creative building possibilities and encourages spatial thinking and problem solving. Each of the seven different color blocks has a different function, and it's the world's only kinetic marble run. Providing over a thousand happy playing hours, Quadrilla is worth every penny. All Quadrilla marble run sets are crafted with heirloom quality birch and rubber wood for long-lasting marble racing fun. Every Quadrilla marble run is different and provides a combination of a great mix of spins, drops, seesaws, and speed that will have marbles going every which way! The Sonic Playground Marble attachment adds the dimension of sound to any Quadrilla marble run, with a xylophone rail that plays a musical scale as marbles race over it. Create a unique soundtrack for your marble run with this musical piece! As with every Hape Quadrilla Marble Run Construction Sets, it combines easily with other Hape Quadrilla products for expansion and unique combinations that will enhance your child's play experience. Hape Toy finishes are all non-toxic, child safe and of the highest quality. Hape constructs their toys using FSC accredited wood products. Hape toys stimulate children through every stage of development and help nurture and develop their natural abilities. All Hape products meet or exceed all applicable safety standards.